Where the hell did Stannis come from, and how did he arrive? How did Arya get that boat? And who the fuck is the guy in the tree?

Aswiththerestofthisseasonto this point, we've put together a list of scenes, references, and characters that deserve a special comment or mention. There's no way we got all the good stuff (and we might be wrong on some of the things we've left below)—so please help expand our appendix.